Especially for Niki (our jigmaker extradonaire!) and for all of you other jig builders on here, I have found a very interesting book at our state library, "Woodworker's Essential Shop Aids & Jigs", by Robert Wearing.
(1) Holding and Cramping
(3) Routing Methods
(4) Machine-Made Joints
(5) The Sawbench
(6) The Drilling Machine
(7) The Lathe
Appendices (Cramp Handles, Easing a Hole, Threads and Nuts in Wood, Fixing Pressure Feet on Cramps, .....
I've only briefly scanned the book, but it looks very interesting and useful. The book is available on Amazon as a used book and I see a copy on ebay so it can still be found if one wants to look.